Examine source code of GitLab Details Sidebar

{
  "name": "GitLab Details Sidebar",
  "description": "Adding a details view to the sidebar of GitLab boards",
  "version": "0.6.0",
  "manifest_version": 2,
  "icons": {
    "16": "icon@16.png",
    "32": "icon@32.png",
    "48": "icon@48.png"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://gitlab.com/*"
      ],
      "run_at": "document_idle",
      "all_frames": false,
      "js": [
        "board-enhancement.js"
      ],
      "css": [
        "board-enhancement.css"
      ]
    }
  ],
  "permissions": [
    "https://gitlab.com/*",
    "contextMenus",
    "activeTab",
    "webRequest",
    "webRequestBlocking"
  ],
  "optional_permissions": [
    "http://*/*",
    "https://*/*"
  ],
  "browser_action": {
    "default_popup": "popup.html"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{4df68d77-cf6d-4ac4-829d-9ff46fedd628}"
    }
  }
}